LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1

LMV324-N, LMV324-N-Q1

SNOS012I – AUGUST 2000 – REVISED FEBRUARY 2013

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Figure 53. Indirectly Driving A Capacitive Load with DC Accuracy

INPUT BIAS CURRENT CANCELLATION

The LMV321-N/LMV358-N/LMV324-N family has a bipolar input stage. The typical input bias current of LMV321-

N/LMV358-N/LMV324-N is 15 nA with 5V supply. Thus a 100 k

Ω input resistor will cause 1.5 mV of error voltage.

By balancing the resistor values at both inverting and non-inverting inputs, the error caused by the amplifier's

input bias current will be reduced. The circuit in Figure 54 shows how to cancel the error caused by input bias

current.

Figure 54. Cancelling the Error Caused by Input Bias Current

TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS

Difference Amplifier

The difference amplifier allows the subtraction of two voltages or, as a special case, the cancellation of a signal

common to two inputs. It is useful as a computational amplifier, in making a differential to single-ended

conversion or in rejecting a common mode signal.

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Product Folder Links: LMV321-N LMV321-N-Q1 LMV358-N LMV358-N-Q1 LMV324-N LMV324-N-Q1